Newby Dog Owner question: Panosteitis

This will come and go until the dog is grown up but will not leave deficits. Make sure you feed him with low fat, low proteine and low calcium. If you could change the feeding to BARF you will lessen the problem a lot. The illness is on the tube bones only and the dog should be kept a little slim to lessen the load on the bones but of course no starving. You can take him into the pool for a little swim but not too much running on the hard floor. If he wants to work despite the illness, you should lay short trails for him to use his nose (and his brain) - that will make him tired within 50 or 100 yards so not a lot of walking but a lot of sniffing and finding a sausage at the end of trail.
Good luck!

No vet but 30 years of dogs, started with a great dane and a Dobermann puppy, went to a lot of dog shows, won a world championship with a mastiff in Milano/Italy and finally realised what a bunch of idiots most so-called breeders are so I turned upside down and got all the following 15 dogs from shelters or pounds. Mostly great danes as the bigger and older they are, the less chance they have to get a good home. They all had a super life with us here and are all buried in my own 20000 sq meters backyard. They came with all sorts of health problems and we always found a solution. The easiest way to cure stomach, kidney and liver problems, apart from matt fur or wet spots in fur/on the skin is always the food. Go back to nature and leave all the chemical crap in the ready-mixes behind you and treat your dog like a wulf. Here in Germany we call it barf - "born again raw feeders" or "bones and raw food". Be aware that cattle meat in USA might be polluted a lot more with antibiotic/toxic crap than it is here in Europe. The meat with the least chance of upsetting your dogs stomach is horse. Here in Germany we could buy all sorts of meat that was put through the grinder and then frozen into plastic bags. Additional food to the meat should contain minerals, vitamins and oils. Have a look at this site, it explains it: https://www.barfworld.com/ForDigestion/DogFoodforSensitiveStomachs
So what would I do to your dog: I would reduce the amount of his regular food to 1/2 and add meat to compensate. After a couple days I would reduce again and add meat and that additional stuff. Within a week you would be completely away from the factory crap and your dog should be feeling better, his stomach will be used by then to handle the raw meat. To make the meat ready for feeding I have one portion thawing on the kitchen table every day. Don´t put it in the microwave, don´t let it sit in the heat. If the portion is to much for one day it is no problem to put it in the fridge as long as its only cooled but not frozen again. Feed your dog in the morning after the walk or swim and feed him in the evening. His stomach relies on proper timing so adjust your day to his needs now. I feed at 9 am and 6 pm - everyday, everywhere. Your dog will need around 250 grams meat twice a day plus the additional food containing all other essentials.Be aware that the dog needs a rest after the feeding so no children playing with him etc, just leave him alone for at least an hour.
Try the barf thing - it´s the single most effective cure to a lot of problems, I hope you will get the desired results.
Good luck!

My Rufus does that. Basically normal for him. He eats so fast too. Blows out a soft one then drops some unformed in another spot.

Our Newfoundland eats raw. Small turds and zero food issues for what it's worth.